Alan McKay wrote:
> On Thu, Mar 25, 2010 at 4:15 PM, Scott Marlowe <scott.marlowe@gmail.com> wrote:
>> These questions always get the first question back, what are you
>> trying to accomplish? Different objectives will have different
>> answers.
>
> We have a real-time application that processes data as it comes in.
> Doing some simple math tells us that a disk-based DB cannot possible
> perform fast enough to allow us to process the data.
>
>> Now, if your pg_xlog directory is a problem, then you either need
>> bigger faster hard drives, or your data is more transient in nature
>> and you can recreate it and you put the whole db into RAM.
>
> When we only saw a 3x improvement in speed with the RAM based DB, we
> were still seeing a fair bit of disk activity but were not sure what
> was going on. Then we thought about pg_xlog and moved it to RAM as
> well, but as I recall still not a great improvement.
Have you considered using one of these:
http://www.acard.com/english/fb01-product.jsp?idno_no=270&prod_no=ANS-9010&type1_title=
Solid State Drive&type1_idno=13
Gordan
